Want to take advantage of the coming airfare wars? Here’s advice from George Hobica, founder of Airfarewatchdog.com:

— Sign up for as many mobile alerts from apps, airlines and airports as make sense for your travel needs. “The best sales are unadvertised,” he says. Also, keep in mind that Delta doesn’t share its fares with all travel apps, and Southwest keeps its fares to itself (though Airfarewatchdog.com sends Southwest alerts to its followers).

— Don’t check only on Tuesdays. Hobica says it’s a myth that airlines post their best fares then. “There’s no right time to buy.”

— Purchase one-way tickets instead of round-trips. “Unless you are seriously loyal to one airline,” Hobica suggests you check out the “hacker fares” that combine two low-priced flight legs. If the best deal would be “flying down on Delta and back on Southwest,” then book that.

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